First I want to say this game was amazing I think i have 100% it so far and I'm really looking forward to the next updates.
second I love the lore its great and I cant wait for resolution for what's going on and for the characters stories
third I don't know how op you wanted to make root and luna but they are powerful with roots ability to snowball dmg and luna being able to stall and grind nightshade cause idk if 2 shoting the no-skin man was intentional, besides them I also don't see much use of noire's gun in the second half because there are no major upgrades towards its dmg besides gunpowder but by that point its just much more worth it to get the no.48 and get a few relics and nightshade to do quite a lot of dmg. these options don't take away from the fun I think it just makes it really easy to beat the game and it takes away most of the challenge, that being said
fourth (spoilers for secrets) I would have not been able to beat NoEye-Soft/ her final boss combo without luna's crazy dmg, I don't know if the intent was for those bosses to be back to back but I had exhausted all my items and heals only to barely have beat them and if you plan on nerfing luna idk if it would be winnable.
that's about it I loved playing this game and its absolutely fabulous.